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// -*- mode:objc -*-
/*
** DVR.m
**
** Copyright 2010
**
** Author: George Nachman
**
** Project: iTerm2
**
** Description: Implements a "digital video recorder" for iTerm2.
** This is used by the "instant replay" feature to record and
** play back the screen contents.
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#import "DVR.h"
#import "DVRIndexEntry.h"
#include <sys/time.h>
@implementation DVR
- (id)initWithBufferCapacity:(int)bytes
{
if ([super init] == nil) {
return nil;
}
buffer_ = [DVRBuffer alloc];
[buffer_ initWithBufferCapacity:bytes];
capacity_ = bytes;
decoders_ = [[NSMutableArray alloc] init];
encoder_ = [DVREncoder alloc];
[encoder_ initWithBuffer:buffer_];
return self;
}
- (void)dealloc
{
[decoders_ release];
[encoder_ release];
[buffer_ release];
[super dealloc];
}
- (void)appendFrame:(char*)buffer length:(int)length info:(DVRFrameInfo*)info
{
if (length > [buffer_ capacity] / 2) {
// Protect the buffer from overflowing if you have a really big window.
return;
}
int prevFirst = [buffer_ firstKey];
if ([encoder_ reserve:length]) {
// Leading frames were freed. Invalidate them in all decoders.
for (DVRDecoder* decoder in decoders_) {
int newFirst = [buffer_ firstKey];
for (int i = prevFirst; i < newFirst; ++i) {
[decoder invalidateIndex:i];
}
}
}
[encoder_ appendFrame:buffer length:length info:info];
}
- (DVRDecoder*)getDecoder
{
DVRDecoder* decoder = [[DVRDecoder alloc] initWithBuffer:buffer_];
[decoders_ addObject:decoder];
[decoder release];
return decoder;
}
- (void)releaseDecoder:(DVRDecoder*)decoder
{
[decoders_ removeObject:decoder];
}
- (long long)lastTimeStamp
{
DVRIndexEntry* entry = [buffer_ entryForKey:[buffer_ lastKey]];
if (!entry) {
return 0;
}
return entry->info.timestamp;
}
- (long long)firstTimeStamp
{
DVRIndexEntry* entry = [buffer_ entryForKey:[buffer_ firstKey]];
if (!entry) {
return 0;
}
return entry->info.timestamp;
}
@end
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